The data source object supplies your application with connections for accessing the database. How can i make sure that my servers are available while restarting a cluster? Use the option ripplestart … It first stops and then restarts each member of the cluster. You can do this from the administration console. So it looks something like this: Use rollout update option.
This option sequentially updates an application on multiple cluster members across a cluster. Rollout update will save the application configurations then stops the cluster members on a node then syncs the configuration and stat the clusters members on that node. Then it proceeds to the next node and does the same steps. WebSphere administration console has a utility using which you can see what classes are loaded at what scope for an application.
We have some issue with our application server and we tried killing it using kill-9 command, the process disappeared for few seconds but it is back again. We did not start the server but it started. What would be the reason? Here we have an option Automatic Restart, this Specifies whether the process should restart automatically if it fails. On distributed systems, the default is to restart the process automatically. Is there a way i can start my server along with nodeagent? Here we have an option Node Restart State which specifies the desired behavior of the servers after the node completely shuts down and restarts.
The moment you ask this question, the first question that comes to mind is WebSphere application server. In reality, WebSphere is the name of a product family. IBM has many more products under the brand name WebSphere.
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What is a profile in websphere Application Server? When you install WebSphere application server, executable files and configurations files are separated. This allows you install the product once and create multiple sets of configurations which use the same underlying core executables of the websphere application server installation. These are the profiles in websphere application server. As you know, there are many types of profiles and you can create multiple profiles. What does nodeagent do in websphere Application Server? We will have one nodeagnet per one node.
The node agent acts as an mediator between the Deployment manmager and the node. The sycn process makes sure that the configuration in both local and master repositories are same and in-sync. What is websphere plug-in for web server and where do i need to install the plug-in? It is common practise to have web and app servers on different machines.
WebSphere provides a plug-in which enables web server to talk to application server, this is known as web server plug-in. Web server plug-in will have a configuration file named plugin-config. Select a web server and click generate plugin configuration file and then propagate the plugin. This plug-in needs to be installed on the web server machine. Do i need a web server if i have a websphere application server?
General – Interview Questions & Answers – IBM WebSphere Application Server (WAS)
Web Server and WebSphere application server provide two different functionalities. WebSphere application server do has an inbuilt web server functionality but it is recommended to use a separate web server for many reasons. Some of them are: By seperating web and application server activities, your application serving environment is more secure.
Using the webserver you can load balance the requests between multiple application servers. It is recommended to modify all the configurations using the administration console. When you need to make any configuration changes, you need do the apply changes and sync them. Any changes you do at local repository level are discarded upon the next restart of that server because the sync is always from DMGR to local repository and changes are not saved to master repository. For example, if you edit a configuration file of server1 and restart it… the changes are lost.
When the server starts it syncs the configuration from master repository. Even if DMGR is down, rest of the server will continue to run and serve the applications. However, any changes you make in this situation are not saved to master configuration repository. I installed a new application, what do i need to do before i can access it from the web server URL? When you install a new application or update an application, your web server needs to be aware of the changes.
Which means you need to update the web server plug-in configuration file. So after a successful installation of an application with mapping to web server, you need to regenerate the plug-in configuration file and propagate it to web server. Tracing is when you go through an entire program and record the value of variables and the output.
You trace a program when you want to find out what actually went wrong. SSL are digital signed certificates. Generally encrypt at Sender side and decrypt at receiver side. It is part of ITIL process…..
Frequently asked questions about WebSphere Application Server security
First look at the logs for errors. If you find the error, save the logs and start ur application. Then start trouble shoot. If no error found, run a trace and look for FFDC etc.. No relation. Heap settings should be made depends on application. A file descriptor is a handle created by a process when a file is opened. There is a limit to the amount of file descriptors per process. You trace a program when you want to find out what actually went wrong.
SSL are digital signed certificates. Generally encrypt at Sender side and decrypt at receiver side. It is part of ITIL process….. First look at the logs for errors. If you find the error, save the logs and start ur application.
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Then start trouble shoot. If no error found, run a trace and look for FFDC etc.. No relation. Heap settings should be made depends on application. A file descriptor is a handle created by a process when a file is opened. There is a limit to the amount of file descriptors per process. If the file descriptor limit is exceeded for a process, you may see the following errors: To troubleshoot the issue, you decided to take it out of the cluster. How do you do that?
Make its runtime weight to 0. In a complex environment, there are 10 machines. The administrator decided to send twice as many request as machineB to machineA. How can he achive it? The lead admin told you to make sure that there should not be any downtime during this recycle.
Which option do you use to achieve it? A large application which has 5web modules has been deployed on to a cluster.
Interview Questions – WebSphere Application Server Notes
After some months, the developer asked you to update on of the 5web modules. How do you do it? What is virtual host in websphere application server? Virtual host is a configuration not a physical one. A configuration that lets a single machine resemble multiple host machines. Each virtual host has a logical name and a list of one or more DNS host aliases by which it is known.